CONFIRMING STATEMENT


This Statement confirms that the undersigned, Balakrishnan S. Iyer,
has authorized
and designated Robert Lelieur, John Cobb or
Laura Bright of Power Integrations, Inc. (the "Company"),
or Bruce E. Schaeffer, David A. Hubb, Catia Hagopian or Andrew Thornborrow of
Gray Cary Ware & Freidenrich LLP to execute and file on the undersigned's
behalf all Forms 3, 4 and 5
(including any amendments thereto) that the undersigned may be
required to file with the U.S. Securities and Exchange Commission
as a result of the
undersigned's ownership of or transactions in
securities of the Company.
The undersigned acknowledges that
Bruce E. Schaeffer, David A. Hubb, Catia Hagopian
or Andrew Thornborrow are not assuming any of the
undersigned's responsibilities
to comply with Section 16 of the
Securities Exchange Act of 1934.



Dated February 13,2004


\S\ Balakrishnan S. Iyer